35 weeks and cramping and diarrhea.

I am technically 35 weeks tomorrow and I started having sharp period like cramps. Two days prior I had diarrhea. I’m kind of worried that something may be starting to happen. I would like to keep her in till at least 36 weeks. Should I worry? My doctor said at my 34 week appointment that as of midnight that night she would not stop labor if I went into it. I guess that should make me feel better but it’s been 10 years since I’ve given birth and I’m really nervous.